SUMMARY: Phosphoglycerate mutase has been purified from methanol-grown and by acid precipitation, heat treatment, ammonium sulphate fractionation, Sephadex G-50 gel filtration and DEAE-cellulose column chromatography. The purification attained using the extract was 72-fold, and using the extract, 140-fold. The enzyme purity, as shown by analytical polyacrylamide gel electrophoresis, was 50% from and 40% from . The enzyme activity was associated with one band. The purified preparations did not contain detectable amounts of phosphoglycerate kinase, phosphopyruvate hydratase, phosphoglycerate dehydrogenase or glycerate kinase activity. The molecular weight of the enzymic preparation was 32000·3000. The enzyme from both organisms was stable at low temperatures and, in the presence of 2,3-diphosphoglyceric acid, could withstand exposure to high temperatures. The enzyme from has a broad pH optimum at 7·0 to 7·6 whilst the enzyme from has an optimal activity at pH 7·3. The cofactor 2,3-diphosphoglyceric acid was required for maximum enzyme activity and high concentrations of 2-phosphoglyceric acid were inhibitory. The values for the enzyme were: 3-phosphoglyceric acid, 6·0 x 10 ; 2-phosphoglyceric acid, 6·9 x 10 ; 2,3-diphosphoglyceric acid, 8·0 x 10 ; and for the enzyme: 3·4 x 10 , 3·7 x 10 and 10 x 10 respectively. The equilibrium constant for the reaction was 11·3 ± 2·5 in the direction of 2-phosphoglyceric acid to 3-phosphoglyceric acid and 0·09 ± 0·02 in the reverse direction. The standard free energy for the reaction proceeding from 2-phosphoglyceric acid to 3-phosphoglyceric acid was -5·84 kJ mol and in the reverse direction +5·81 kJ mol.


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